Question: We throw two dice simultaneously until either a sum of 7 or a sum of 9 occurs. What is the probability that (i) exactly n

We throw two dice simultaneously until either a sum of 7 or a sum of 9 occurs.

What is the probability that

(i) exactly n throws will be needed?

(ii) the experiment stops with the last throw having an outcome 9?

(iii) the experiment stops with the last throw having an outcome 7?

(iv) the experiment carries on forever?

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